The total mass attenuation coefficients (μ/ρ), for pure Ti, Co, Cu and TixCo1-x and CoxCu1-x (x=0.8, 0.7, 0.6, 0.5, 0.4, 0.3 and 0.2) alloys were measured at 22.1, 25.0, 59.5 and 88.0keV photon energies. The samples were irradiated with 109 Cd and 241 Am radioactive point source using transmission arrangement. The X- and γ-rays were counted by a Si(Li) detector with resolution of 160eV at 5.9keV. Total atomic and electronic cross-sections (σt and σe), effective atomic numbers (Z eff ) and electron densities (N el ) were determined using the obtained μ/ρ values for investigated 3d alloys. The theoretical mass attenuation coefficients were estimated using mixture rule and the experimental values of investigated parameters were compared with the calculated values.